Fluctuating diffusivity emerges even in binary gas mixtures

Fumiaki Nakai, Yuichi Masubuchi, Yuya Doi, Takato Ishida, and Takashi Uneyama
Phys. Rev. E 107, 014605 – Published 18 January 2023

Abstract

Diffusivity in some soft matter and biological systems changes with time, called the fluctuating diffusivity. In this work, we propose a novel origin for fluctuating diffusivity based on stochastic simulations of binary gas mixtures. In this system, the fraction of one component is significantly small, and the mass of the minor component molecule is different from that of the major component. The minor component exhibits fluctuating diffusivity when its mass is sufficiently smaller than that of the major component. We elucidate that this fluctuating diffusivity is caused by the time scale separation between the relaxation of the velocity direction and the speed of the minor component molecule.

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  • Received 15 July 2022
  • Revised 28 October 2022
  • Accepted 22 December 2022

DOI:https://doi.org/10.1103/PhysRevE.107.014605

©2023 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & Thermodynamics

Authors & Affiliations

Fumiaki Nakai*, Yuichi Masubuchi, Yuya Doi, Takato Ishida, and Takashi Uneyama

  • Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan

  • *nakai.fumiaki.c7@s.mail.nagoya-u.ac.jp
  • uneyama@mp.pse.nagoya-u.ac.jp

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Issue

Vol. 107, Iss. 1 — January 2023

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